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' P0 is an output ' LED On ' Delay 1/4 second ' LED off ' Repeat
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When doing any kind of programming for the first time, or if you encounter a problem, it is recommended that you try to come up with three different ways of performing a task. The first way, while it works, might not be the most efficient or easily understood method of performing the task. Writing directly to the I/O ports using assignment statements may be confusing to some people. A second way of flashing the LED on and off could be to use the built-in HIGH and LOW PBASIC functions rather than writing to the I/O ports directly. These functions avoid the need for writing to the bits directly:
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15.5 SAMPLE INTERFACE APPLICATIONS
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3x AA Batteries
8x5x2mm LEDs
FIGURE 15-10 BS2 with serial communications/programmer interface and eight LEDs.
FIGURE 15-11 The circuit is very simple when 5 2 mm LEDs are bent into shape as shown here.
THE BASIC STAMP 2 MICROCONTROLLER
TABLE 15-6 BS2 LEDs Programmer Misc.
BS2 LED Experimentation Circuit Parts List Parallax BASIC Stamp 2 5 2 mm Red LEDs BS2 Programmer/Communications Interface Breadboard, 3x AA Alkaline Battery Clip, Breadboard Wires, Power Switch
' LED Flash Demonstration 2 - Flash LED on P0 2 per second '{$STAMP BS2} '{$PBASIC 2.5} ' Mainline DO LOW 0 PAUSE 250 HIGH 0 PAUSE 250 LOOP
' LED On ' Delay 1/4 second ' LED off ' Repeat
Finally, when looking up the HIGH and LOW functions, you might have discovered the TOGGLE function, which changes the output state of an I/O pin. This feature makes the program even simpler:
' LED Flash Demonstration 3 - Flash LED on P0 2 per second '{$STAMP BS2} '{$PBASIC 2.5} ' Mainline OUTPUT 0 DO TOGGLE 0 PAUSE 250 LOOP
' LED = LED ^ 1 ' Delay 1/4 second ' Repeat
It is recommended that you play around with the LEDs and try to come up with different applications to demonstrate how the various functions work. For example, you might want to create a Cylon Eye using the eight LEDs using the code:
' LED Flash Demonstration 4 - Cylon Eye '{$STAMP BS2} '{$PBASIC 2.5} Direction VAR Bit ' Up/Down Direction ' Mainline DIRL = $FF OUTL = 1 Direction = 0 ' ' ' P7:P0 Outputs P0 is On Go Up
15.5 SAMPLE INTERFACE APPLICATIONS
DO PAUSE 100 ' Delay 1/10 second IF (Direction = 0) THEN ' Select Direction OUTL = OUTL << 1 ' Shift Up the Turned on LED IF (OUT7 = 1) THEN Direction = 1 ELSE ' Go in Opposite Direction OUTL = OUTL >> 1 IF (OUT0 = 1) THEN Direction = 0 ENDIF LOOP ' Repeat
Don t be afraid to try new ideas and if they don t work, spend some time trying to understand what the problem is and fix it. A good rule of thumb is that your first real program will take two weeks to get running properly, your second program a week, the third two days, the fourth four hours, and so on until you are very familiar with programming the BS2 and looking at different ways of approaching the problems. The Cylon Eye program probably seems very impressive and most likely very difficult to implement on your own, but if you work at the problem, try out different things, and always keep in the back of your mind that you want to think of three different ways of approaching a problem, you will become a competent programmer very quickly.
15.5.3 ADDING SWITCHES AND OTHER DIGITAL INPUTS
LEDs, as well as being useful devices for learning how to program, are excellent status indicators for the current state of the program of different inputs. The most basic input device is the momentary on button, which closes the circuit when pressed. This device can be used along with LEDs to demonstrate how digital inputs are passed to the BS2. The circuit used to test button inputs is shown in Fig. 15-12 and the parts required are listed in Table 15-7. The circuitry was chosen to match that of the previous section to avoid
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